JPH0234425Y2 - - Google Patents
Info
- Publication number
- JPH0234425Y2 JPH0234425Y2 JP9194482U JP9194482U JPH0234425Y2 JP H0234425 Y2 JPH0234425 Y2 JP H0234425Y2 JP 9194482 U JP9194482 U JP 9194482U JP 9194482 U JP9194482 U JP 9194482U JP H0234425 Y2 JPH0234425 Y2 JP H0234425Y2
- Authority
- JP
- Japan
- Prior art keywords
- air
- passage
- fuel
- mixture
- scavenging
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000000203 mixture Substances 0.000 claims description 47
- 230000002000 scavenging effect Effects 0.000 claims description 25
- 230000002093 peripheral effect Effects 0.000 claims 1
- 239000000446 fuel Substances 0.000 description 36
- 239000007789 gas Substances 0.000 description 8
- 238000011144 upstream manufacturing Methods 0.000 description 7
- 238000007664 blowing Methods 0.000 description 4
- 239000000567 combustion gas Substances 0.000 description 3
- 239000000428 dust Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
Landscapes
- Combustion Methods Of Internal-Combustion Engines (AREA)
- Characterised By The Charging Evacuation (AREA)
Description
【考案の詳細な説明】
本考案は、都市ガス等のガスを燃料とする2サ
イクルガスエンジンの給気装置に関するものであ
る。[Detailed Description of the Invention] The present invention relates to an air supply system for a two-stroke gas engine that uses gas such as city gas as fuel.
2サイクルガスエンジンでは、燃料混合気の吹
き抜けを防止するために、掃気行程の初期に、ク
ランク室より送出される混合気に先立つて、シリ
ンダの掃気口とクランク室とを接続する掃気路に
外気導入路を介して導入された、燃料が含まれて
いない空気を噴出して燃焼ガスを吹き払い、次い
で、混合気をシリンダ内に噴出させるようにした
ものがある。また、かかる2サイクルガスエンジ
ンではガス燃料と空気との混合は燃料−空気混合
装置のベンチユリー部で行われ、その混合気は混
合気吸入路を経てクランク室に流入する。供給さ
れる燃料量はベンチユリー部の負圧により決まる
が、低速回転域から高速回転域、低負荷運転域か
ら高負荷運転域までの全運転域において適正な混
合気とするためには、このベンチユリー部の負圧
による燃料量のみの制御だけでは十分でなく、混
合気吸入路へ空気も流入させる必要がある。燃料
−空気混合装置を高負荷運転域に適合させると、
低負荷運転域では混合気が濃厚になりすぎるの
で、混合気吸入路のスロツトル弁よりクランク室
寄りの下流部分に負圧路を接続して大気に連通さ
せスロツトル弁下流の負圧に応じて空気を供給す
る。 In a two-stroke gas engine, in order to prevent the fuel mixture from blowing through, outside air is introduced into the scavenging passage connecting the scavenging port of the cylinder and the crank chamber at the beginning of the scavenging stroke, prior to the mixture being sent out from the crank chamber. There is one in which fuel-free air introduced through an introduction path is ejected to blow away combustion gas, and then the air-fuel mixture is ejected into the cylinder. Furthermore, in such a two-cycle gas engine, gas fuel and air are mixed in a ventilate section of a fuel-air mixing device, and the mixture flows into the crank chamber through an air-fuel mixture intake passage. The amount of fuel supplied is determined by the negative pressure in the ventilate section, but in order to obtain the appropriate mixture in the entire operating range from low speed to high speed and from low load operation to high load operation, the amount of fuel supplied is determined by the negative pressure in the ventilate. It is not enough to control only the amount of fuel using negative pressure in the air-fuel mixture; it is also necessary to allow air to flow into the air-fuel mixture intake passage. Adapting the fuel-air mixer to high-load operating ranges
In low-load operating ranges, the air-fuel mixture becomes too rich, so a negative pressure path is connected to the downstream part of the air-fuel mixture suction path closer to the crank chamber than the throttle valve and communicated with the atmosphere, allowing air to flow in response to the negative pressure downstream of the throttle valve. supply.
空気を機関に供給する際は、大気中の塵埃を除
去するためにエアクリーナを通過させる。そし
て、混合気吸入路の上流側にはエアクリーナが配
置されており、このエアクリーナに上記外気導入
路および負圧路の他端をそれぞれ接続すると、エ
アクリーナの容量を極端に大きくしない限り所要
の掃気路および混合気吸入路への空気量が不足す
ることがあり、また、混合気吸入路と外気導入路
が連通されるため燃料が外気導入路へ逆流する虞
があることが本考案者の実験の結果判明した。 When air is supplied to the engine, it is passed through an air cleaner to remove dust from the atmosphere. An air cleaner is arranged upstream of the air-fuel mixture suction passage, and if the other ends of the outside air introduction passage and the negative pressure passage are connected to this air cleaner, the required scavenging passage will be completed unless the capacity of the air cleaner is made extremely large. The inventor's experiments have shown that the amount of air flowing into the mixture intake passage may be insufficient, and since the mixture intake passage and the outside air introduction passage are communicated, there is a risk that fuel may flow back into the outside air introduction passage. The result is clear.
そこで、本考案は上記の事情に鑑みガス燃料と
空気とを適正な混合気とし掃気行程の初期に適量
の空気量を掃気口からシリンダ内へ噴出させ燃料
混合気の吹き抜けを防止するようにし、しかも供
給空気量は全運転域において適量で、且つ、燃料
の混合気吸入路から外気導入路への逆流を防止す
べく、外気導入路と混合気吸入路のスロツトル弁
よりクランク室寄りの下流部分に接続した負圧路
とを連通させて、混合気吸入路の上流側のエアク
リーナとは別箇のエアクリーナに接続したもので
ある。 Therefore, in view of the above-mentioned circumstances, the present invention creates a proper mixture of gas fuel and air and injects an appropriate amount of air into the cylinder from the scavenging port at the beginning of the scavenging stroke to prevent the fuel mixture from blowing through. In addition, the amount of air supplied is appropriate throughout the operating range, and in order to prevent the backflow of fuel from the mixture intake passage to the outside air introduction passage, the air intake passage and the air mixture intake passage are provided at downstream portions of the outside air introduction passage and the mixture intake passage near the throttle valve. The air-fuel mixture suction passage is connected to an air cleaner separate from the air cleaner on the upstream side of the air-fuel mixture suction passage.
以下、本考案を添付する図面に示す具体的な実
施例に基いて詳細に説明する。 Hereinafter, the present invention will be described in detail based on specific embodiments shown in the accompanying drawings.
この2サイクルガスエンジンのシリンダ1の周
面に開口した掃気口2はクランク室3に掃気路4
で接続する。また、燃料−空気混合装置5を備え
る混合気吸入路6をクランク室3に連通させ、混
合気吸入路6の上流側に大気中の塵埃を除去する
エアクリーナ7を設け、混合気吸入路6の燃料−
空気混合装置5の下流側にスロツトル弁8を配置
し、クランク室3内が負圧になると空気はエアク
リーナ7を経て燃料−空気混合装置5に流し、そ
のベンチユリー部に負圧を生じしめ、そこで燃料
を吸引して空気と燃料とが混じり混合気となり、
クランク室3に供給される。 A scavenging port 2 opened on the circumferential surface of the cylinder 1 of this two-cycle gas engine connects a scavenging passage 4 to a crank chamber 3.
Connect with. Further, a mixture suction passage 6 equipped with a fuel-air mixing device 5 is communicated with the crank chamber 3, and an air cleaner 7 for removing dust in the atmosphere is provided on the upstream side of the mixture suction passage 6. Fuel-
A throttle valve 8 is disposed on the downstream side of the air mixing device 5, and when the inside of the crank chamber 3 becomes negative pressure, the air flows through the air cleaner 7 to the fuel-air mixing device 5, creating a negative pressure in the ventilate section, and then Fuel is sucked in and air and fuel mix to form a mixture.
It is supplied to the crank chamber 3.
掃気路4の掃気口寄り部は外気導入路9を介し
て、前記混合気吸入路6の上流側のエアクリーナ
7と別箇で、それより小容量のエアクリーナ10
に連通接続し、外気導入路9の掃気路寄り部は混
合気吸入路6と平行状に配置し、そこに前記スロ
ツトル弁8の回動軸を延設してスロツトル弁8と
ほぼ同位相で流路を開閉する空気制御弁11を設
ける。また、低負荷運転域における濃厚な混合気
を空気を供給して希釈して適正な混合気とするた
めに、混合気吸入路6のスロツトル弁8よりクラ
ンク室寄りの下流部分12に負圧路13の一端を
開口し他端を前記外気導入路9のエアクリーナ寄
り部に連通接続する。 The scavenging port side portion of the scavenging passage 4 is connected via the outside air introduction passage 9 to an air cleaner 7 on the upstream side of the air-fuel mixture suction passage 6, and an air cleaner 10 having a smaller capacity than the air cleaner 7.
The part of the outside air introduction passage 9 near the scavenging passage is arranged parallel to the air-fuel mixture suction passage 6, and the rotation axis of the throttle valve 8 is extended thereto so that it is in substantially the same phase as the throttle valve 8. An air control valve 11 is provided to open and close the flow path. In addition, in order to supply air to dilute the rich mixture in the low-load operating range and make it a proper mixture, a negative pressure path is provided in the downstream portion 12 of the mixture suction passage 6 closer to the crank chamber than the throttle valve 8. One end of 13 is opened, and the other end is connected to a portion of the outside air introduction path 9 near the air cleaner.
符号14は排気ポート、15はクランク軸、1
6はピストン、17はコンロツド、18はシリン
ダブロツクをそれぞれ示す。 14 is an exhaust port, 15 is a crankshaft, 1
6 is a piston, 17 is a connecting rod, and 18 is a cylinder block.
次に、作動について説明する。 Next, the operation will be explained.
混合気は、クランク室3の負圧によりエアクリ
ーナ7を経て混合気吸入路6の燃料−空気混合装
置5のベンチユリー部に流入した空気が、そこに
負圧を生ぜしめ燃料を吸引し混合して生起し、ク
ランク室3に供給される。 The air-fuel mixture is generated by the negative pressure in the crank chamber 3, which causes air to flow into the ventilate section of the fuel-air mixing device 5 in the air-fuel mixture suction passage 6 through the air cleaner 7, which creates a negative pressure there, sucks in fuel, and mixes it. and is supplied to the crank chamber 3.
外気導入路9は掃気路4の掃気口寄り部に連通
接続されており、混合気吸入路6上流側エアクリ
ーナ7とは別箇のエアクリーナ10を経て外気導
入路9に流入した燃料を全く含まない空気は、掃
気行程の初期にクランク室3より送出される混合
気に先立つて掃気口2よりシリンダ1内に噴出し
燃焼ガスを吹き払う。シリンダ1内に噴出する空
気量は外気導入路9の掃気路寄り部にスロツトル
弁8と連動する空気制御弁11が設けてあり、ま
た、この空気制御弁11はスロツトル弁8とほぼ
同位相で流路を開閉するように設定してあるの
で、スロツトル弁8が開き混合気を多量に供給す
る高負荷運転時には空気制御弁11も開き、多量
の空気をシリンダ1内に噴出し、スロツトル弁8
の開度が小さい低負荷運転時には空気制御弁11
も同様に開度が小さく少量の空気をシリンダ1内
に噴出させるようにし、低負荷運転時には外気導
入路9から流入する空気量が過多となつて、熱効
率が下つたり、エンストが起こらないようにして
ある。 The outside air introduction passage 9 is connected to a portion of the scavenging air passage 4 near the scavenging port, and does not contain any fuel that has flowed into the outside air introduction passage 9 via an air cleaner 10 that is separate from the air cleaner 7 on the upstream side of the mixture intake passage 6. Air is ejected into the cylinder 1 from the scavenging port 2 in advance of the air-fuel mixture sent out from the crank chamber 3 at the beginning of the scavenging stroke to blow away the combustion gas. The amount of air injected into the cylinder 1 is controlled by an air control valve 11 that is connected to the throttle valve 8 and is provided in the outside air introduction path 9 near the scavenging path. Since the flow path is set to open and close, the air control valve 11 also opens during high-load operation when the throttle valve 8 opens and supplies a large amount of air-fuel mixture, blowing out a large amount of air into the cylinder 1, and opening the throttle valve 8.
During low load operation with a small opening degree, the air control valve 11
Similarly, the opening degree is small so that a small amount of air is blown into the cylinder 1, so that during low-load operation, the amount of air flowing in from the outside air introduction passage 9 becomes excessive, reducing thermal efficiency and preventing engine stalling. It is set as.
低負荷運転時には、燃料−空気混合装置5を高
負荷運転域に適合するように設定していると、混
合気が濃厚になりすぎるので、負圧路12を混合
気吸入路6のスロツト弁8よりクランク室寄りの
下流部分12に開口し、下流部分12の負圧によ
りエアクリーナ10から負圧路13を経て空気を
供給し適正な混合気とする。この下流部分12に
供給する空気量は、そこの負圧の程度に応じて決
まり、スロツトル弁8の開度が小さい低負荷運転
時には下流部分12は負圧が大きく負圧路13よ
り多量の空気が流入し、スロツトル弁8の開度が
大きくなるに従い下流部分12の負圧は小さくな
り流入する空気量も減少する。 During low-load operation, if the fuel-air mixing device 5 is set to suit the high-load operation range, the mixture will become too rich, so the negative pressure path 12 is connected to the slot valve 8 of the mixture intake path 6. It opens in the downstream part 12 closer to the crank chamber, and the negative pressure in the downstream part 12 supplies air from the air cleaner 10 via the negative pressure path 13 to create a proper air-fuel mixture. The amount of air supplied to this downstream section 12 is determined depending on the degree of negative pressure there. During low load operation with a small opening of the throttle valve 8, the downstream section 12 has a large negative pressure and a larger amount of air than the negative pressure path 13. As the opening of the throttle valve 8 increases, the negative pressure in the downstream portion 12 becomes smaller and the amount of air flowing in decreases.
本考案は、上述のように、掃気行程の初期にク
ランク室よりシリンダ内へ送出される混合気に先
立つて燃焼ガスを吹き払う空気を導く外気導入路
と、濃厚な混合気を希釈する空気を供給する混合
気吸入路のスロツトル弁の下流部分に開口する負
圧路とを連通接続して、混合気吸入路上流側エア
クリーナとは別箇のエアクリーナに接続したか
ら、掃気路および混合気吸入路への空気量が不足
することは皆無となる。混合気吸入路上流側エア
クリーナとは別個のエアクリーナに接続したか
ら、掃気行程の初期に適量の空気量を掃気口から
シリンダ内へ噴出させ燃焼効率を向上させ、しか
も供給空気量は全運転域において適量である。そ
の上、混合気吸入路と外気導入路とを空気の供給
に関し積極的に別系統としたため混合気吸入路か
ら燃料が外気導入路へ逆流することは全くなくな
り、燃料混合気の吹き抜けを防止し、燃料消費率
を改善する。 As mentioned above, the present invention includes an outside air introduction passage that introduces air to blow away combustion gases before the air-fuel mixture is sent from the crank chamber into the cylinder at the beginning of the scavenging stroke, and air that dilutes the rich air-fuel mixture. The mixture suction passage to be supplied is connected to the negative pressure passage that opens downstream of the throttle valve, and the mixture suction passage is connected to an air cleaner that is separate from the upstream air cleaner. There will be no shortage of air. Since it is connected to an air cleaner separate from the air cleaner on the upstream side of the air-fuel mixture intake, an appropriate amount of air is injected into the cylinder from the scavenging port at the beginning of the scavenging stroke to improve combustion efficiency, and the amount of air supplied is constant throughout the entire operating range. Appropriate amount. Furthermore, since the mixture intake passage and the outside air introduction passage are actively separated from each other in terms of air supply, fuel will never flow back from the mixture intake passage to the outside air introduction passage, preventing the fuel mixture from blowing through. , improve fuel consumption rate.
図面は本考案の具体的な一実施例で、第1図は
その縦断正面図、第2図はその縦断側面図であ
る。
1……シリンダ、2……掃気口、3……クラン
ク室、4……掃気路、9……外気導入路、6……
混合気吸入路、8……スロツトル弁、12……下
流部分、13……負圧路、7……エアクリーナ、
10……エアクリーナ。
The drawings show a specific embodiment of the present invention, with FIG. 1 being a longitudinal sectional front view thereof and FIG. 2 being a longitudinal sectional side view thereof. 1...Cylinder, 2...Scavenging port, 3...Crank chamber, 4...Scavenging passage, 9...Outside air introduction passage, 6...
Mixture suction passage, 8...Throttle valve, 12...Downstream portion, 13...Negative pressure path, 7...Air cleaner,
10...Air cleaner.
Claims (1)
とを掃気路で接続し、掃気路の掃気口寄り部を外
気導入路を介して大気に連通させる2サイクルガ
スエンジンにおいて、前記外気導入路と、クラン
ク室に連通接続される混合気吸入路のスロツトル
弁よりクランク室寄りの下流部分に接続した負圧
路とを連通させて、外気導入路と負圧路とを、混
合気吸入路の上流側のエアクリーナとは別箇のエ
アクリーナに接続したことを特徴とする2サイク
ルガスエンジンの給気装置。 In a two-stroke gas engine in which a scavenging port opened in the peripheral wall of the cylinder and the crank chamber are connected by a scavenging air passage, and a portion of the scavenging air passage near the scavenging port is communicated with the atmosphere via an outside air introduction passage, the outside air introduction passage and the crank chamber are connected to each other. The outside air introduction passage and the negative pressure passage are connected to the negative pressure passage connected to the downstream part of the mixture suction passage closer to the crank chamber than the throttle valve. An air supply system for a two-stroke gas engine, characterized in that it is connected to an air cleaner separate from the air cleaner.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9194482U JPS58193015U (en) | 1982-06-19 | 1982-06-19 | Air supply system for 2-stroke gas engine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9194482U JPS58193015U (en) | 1982-06-19 | 1982-06-19 | Air supply system for 2-stroke gas engine |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS58193015U JPS58193015U (en) | 1983-12-22 |
JPH0234425Y2 true JPH0234425Y2 (en) | 1990-09-17 |
Family
ID=30100164
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP9194482U Granted JPS58193015U (en) | 1982-06-19 | 1982-06-19 | Air supply system for 2-stroke gas engine |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS58193015U (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE513446C2 (en) * | 1999-01-19 | 2000-09-11 | Electrolux Ab | Crankcase coil internal combustion engine of two stroke type |
US8770159B2 (en) * | 2008-09-24 | 2014-07-08 | Makita Corporation | Stratified scavenging two-stroke engine |
JP5357556B2 (en) * | 2009-01-30 | 2013-12-04 | 川崎重工業株式会社 | Air scavenging type 2-cycle engine |
-
1982
- 1982-06-19 JP JP9194482U patent/JPS58193015U/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS58193015U (en) | 1983-12-22 |
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